Telephone system



G. A. YANOCHOWSKI TELEPHONE SYSTEM Nov. 27 1923. 1,475,216

Filed Aug. 5, 1918 Patentedllov. 27, 1923.

;; rs; srlEs I resale GEORGE A. YANOCHOWSKI, OF, CHICAGO, ILLINOIS, ASSIGNQR TO KELLOGG SWITCH- BOAEID 'AND SUPPLY COMPANY, CHICAGO, ILLINOIS, A CORPORATION ILLINOIS.

TELEPHONE SYSTEM.

Application filed August 5, 1918. Serial'No. 248,239.

To all to/L07, it may concern:

Be it known that I, GEORGE A. YANo CHOWSKI, a citizen of the United States of America, residing at Chicago, in the county of Cook and State oflllinois, have invented certain new and useful Improvements in Telephone Systems, 01" which the following is a specification.

My invention relates to telephone systems and has to do more particularly with party line telephone systems in which means is provided :tor permitting one subscriber to obtain. connection with another subscriber on the same line.

In prior party line telephone systems of the abovementioned type, and of the type disclosed in Patent No. 1,202,867, issued to H. D. Currier, the operator in testing the jack of the called line operates means in the cord circuit 'to transmit a revertive audible tone test to the operator to appraise her of the fact that the called substation is a substation on the calling line. WVhen this condition arises, the operator asks the subscriber calling to replace his receiver so that the called party may be signalled. To signal the called party, the operator withdraws the answering plug from the jack of the calling line and inserts the calling plug into the jack of the calling line and depresses the proper ringing key plunger to connect a generator of the desired "frequency to operate the call bell of the called party, and then depresses a ringing key plunger to connect generator of the desired frequency to operate the call bell of the calling line. The calling subscriber, after hearing his call bell operated, removes his receiver from the switch hook and waits for the called party to answer If the called-subscriber does not answer immediately the calling subscriber winks his switch hook, which causes a supervisory signal to flash, and the operator again goes through the same details of depressing he fringing plungers to signal the calling and called subscribers. This method of procedure uses up a considerable amount of the operators time and is also more'or less confusinggso that should revertive calls happen frequently during a rush hour the ethciency of the operator is lessened and the number of calls she may answer is reduced due to this added attention which she must give to revertive calls This method is also unsatisfactory in,

a circuit arrangement which overcomesthe above-mentioned difficulties and which ineludes a novel circuit arrangement for ringving the calling and the called subscribers bells alternately until the called subscriber answers. I provide a very simple arrangement to accomplish this feature which includes only four relays and a pair of plugs and which takes the place of theregular cord circuit and releases the regular cord circuit for use in establishing other connections. A sufficient number of these circuits is provided to take care of the maximum number or" revertive calls that an operator. is liable to handle. One of the plugs of my circuit is adapted to be inserted into a jack of the polystation line while the other plug is for insertion intone of a plurality of jacks, which jack is associated with a combination of generators and constantly rotating interrupters to alternately ring the calling and called parties call bells. lVhen the circuit or" my invention is connected as just described, nofurther attention isfgiven to this connection by the operator until she receives a disconnect signal notifying her that the connection has terminated. 7 Other features, as well as the above, will be more fully herein-after described. c

For a better understanding of my invention, reference may be had to the accomleft of the drawing, I show a party or polystation line consisting of substations A, B, C and D, equipped with harmonic signal bells, thesaid party line being connected by means of the line conductors 1 and 2 to the exchange. The line conductors l and 2 terminate at the exchange in line cir uit equipment L, comprising the usual line relay LR, line signal S, cut-oil relay CO and'the multiple jacks J. c 7

' The signalling or connecting circuit E, which is used for connecting a party line, to which the calling and called substations are connected,- with the necessary signalling apparatus to ring the call bells or the respective substations, comprises a pair of plugs P and P and four relays' A sleeve "relay SL is provided which isactuated when the: plug P is inserted in thejack of theparty line, and

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a supervisory lamp SS is provided which is lighted upon the actuation of the relay SL, the said lamp remaining lighted until the subscribers answer. A listening key LK is provided which, when actuated, connectsthe .operators set '0 to the tip and ring con- 'ductors of the plug P for the usual listening purposes. A ringing control relay RC is provided which is actuated upon the energization of the sleeve relay SL to control the application of ringing current to'the party line, as will be more "fully hereinafter described. A supervisory relay SR is provided which is adapted to be energized over the subscribers line and which controls the supervisory signal SS. Aringing trip relay ET is provided and is energized when one of the subscribers answers to open the circuit ofthe ringing control-relayRG to prevent further application of ringing current to the line. The plug P is adapted to connect with any one or" a plurality of jacks .J",'J ,.:Zl J J orJ, for purposes that will trafii'c are provided. Each interrupter I,

etc., is provided with three sets ofbrushes, and by describingthe interrupter I, a further description of the others is not thought necessary. The interrupter I is adapted to sequentially close connections between brushes 3-4, 5-43, 78, 3' l, etc. The brushes?) and 4 are adapted to connect 16 cycle ringing current to the jack J; the brushes 5 and 6 are adapted to connect 33 c cle rin' in current to the 'ack J" and the C 2-: 7

brushes 7 and 8 to connect ground to the said jack. As the shaft of the interrupter l is constantly rotating, the 33 cycle current is first connected for a predetermined period to the jack, then disconnected; and for a short period nothing is connected tothe jack; then the 16 cycle current is connected for a predetermined pe riod, then disconnected; and ground is then connected to the jack for a predetermined period. The interrupter I is connected to the 16 and 33 cycle current; interrupter I, to the 16 and 50 cycle current P, to the .16 and 66 cycle current; 1 to the 33'and 5O cycle current; 1 to the 33 and 66 cycle current; and'I -to the 50 and 66cycle current, so-that subscribers Aand-B. A and C, A and'D, B and C, B and D,and'C -and 13' may be signalled by -Iinserting the plug P into the jack of the party line and the plug P intoone or the jacks J, J etc., de-

pending upon which two subscribers upon the party line wish to converse with each other. GeneratorsG, G,'G and G? are provided for supplying the different frequencies of current. 1 6

Having described in general the apparatus embodying my invention, I will now describe in detail the operation of the circuit as illustrated in the accompanying drawing.

By referring to the above patent, the operation of a rcvertive call may be traced,

and when'the operator tests the multiple jack of the called line by placing the tip* of the calling plug to the sleeve of the jack of the called line, should thecalled subscriber be on the same party line as the calling subscriber, the operator willreceive a distinctire tone, known as a :revertive tone, as de- Y scribed in the above-named patent. The operator firstinquires the number ofthe calling substation, advises the calling party to hang up his receiver, and-thenwithdraws the -answering plug of the cord circuit from the jacl: J of the party line. 7 Assuming now that it is the subscriber at the party 'which the subscribers A and B are located;

and the plug P, into the jack J which is associatedwith the 16 and cycle ringing generators. The plug P having been inserted into the. jack 'J, arseries circuit is established "for the cut-off relay C0 of the line circuit L and the sleeve relay bL of the circuit E, which be traced from battery through the winding of the said sleeve relay SL, sleeve eontactsof the connected plug P and jack J, through the windingoit the cut-cit relay'CO to ground. The closing of alternate contact 9 of the sleeve relayi .SL establishes an energizing circuit for the ringing control relay RC, traced from battery throughalternate contact 9 of relay SL, conductor l0, normal contact '11 of the listening key LK,-conductor 12, through the winding of the relay EC, and over conductor'13,to ground at normal contact 14 the ringingtrip relay RT. The closing of alternate contactS) of the relay SL also closes an energizing circuit for the supervisory lamp SS, traced from battery through alternate contact 9 of relay SL, conductor 15, through the lamp SS, and conductor 1.6 to ground at normal contact 17 of thesu-pervisory relay SR. The interrupter I rotating connects '33 cycle ringing current from theuugrounded pole of the generator G, over conductor 18, conductor 19,1-througl1 over conductor 26, through alternate con tact 27 of the relay RC, and through resistance 28 to battery and ground. The call bell at the called substation B is operated for a predetermined period until the insulated segments 29 and 30 engage thecbrushes 5 and 6. When in this position, the brushes 3 and 4 engage the conductive segments 31 and 32, connecting signaling current from the generator G over conductors 83 and 34,.

through brush 3, segments '31 and 32, brush 4, tip contacts of the jack J and plug P", through the winding 22 of the relay RT, over the previously traced path, through the call bell and condenser of the substation A, back to battery and ground at alternate contact 27 of relay RC to ground. The call bell of substation A is now actuated for a period of time until the brushes 3 and 4 engage the insulated seg-' ments S5 and 36, respectively.

A short period of time elapses after generator G is disconnected from the line before generator G is connected to the line. As the interrupter continues its travel, the brushes 7 and 8 engage respectively the conductive segments 37 and 38 to connect ground through the winding 22 of the relay RT during the silent period of the ringing so that should the subscriber answer during,

this period the relay RT will be energized, as will presently be described. The inter rupter I continuing its rotation again starts its cycle of rings so that tho cycle cur rent is connected for a period and then dis connected for a period; then the 16 cycle current is connected for a period and then disconnected for a period. Thus, the called subscriber is signalled and then the calling subscriber is signalled, with a silent period .bet-ween the signals, and this sequence is carried on due to the constantly rotating interrupter l until one of the subscribers answers.

The calling subscriber after replacing his receiver waits to hear his bell ring and knows that as long as his bell is rung intermittently the called subscribers bell is also being rung intermittently, and that as soon as his bell stops ringing he should answer as the called subscriber has already answered. The relay RT remains at normal during the ringing of the subscribers, and should either or the subscribers remove his receiver during stringing period the operation of the switch hook contacts opens the bridge across the line circuit including the condenser and call bell and permits a flow of battery current through the winding 22 of the relay RT, thereby bringing about the actuation of the relay RT. This circuit may be traced from' ground through either the generator G orG, asthe case may be, the tip contacts of the plug P and jack J, winding 22 of relay RT, conductor 28, alternate contact 24, conductor 25, tip contacts of the connected plug and jack P and J, through the now closed contacts of the substation switch hook at the substation A or B, as the case may be, back through the ring contacts of the plug 'P and jack J, and over conductor 26, to batterythrough alternate contact 27 and resistance 28. The relay RT, upon energizing, closes its alternate contact e0, establishing a locking circuit for itself, traced from ground through winding 41 of relay RT, its alternate contact 40, conductor $12, and normal contact 43 of re-ring key RE to battery and ground at alternate contact 9 of relay SL. The relay RT responds to battery current only, andnot to ringing current. The opening of normal contact 14 of relay RT opens the circuit of the ringing control relay RC, and the opening of alternate contacts 24 and 27 of said relay prevents further applications of ringing current to the line.

The closingof normal contacts 2e; and 27 of relay RC closes an energizing circuit for the supervisory relay SR, traced from battery through the lower winding of said relay SR, normal contact 27 of relay RC, conductor 26, ring contacts of the connected plug P and jack J the now closed contact of the substation switch'hook, back throughtip cont-actsof the connected jack J and plug P,'conductor 25, normal contact 24-, and through the upper winding of the relay SR to ground. The opening of normal contact 17 of supervisory relay SR opens the energizing circuit o'tthe supervisory lamp SS, notifying the operator that the sub-. scribers are now in conversational circuit. Had the called subscriber failed to respond, the removal of the receiver at the calling substation and the operation of the switch hook flashes the supervisory lamp to notify hook contacts, anc. the relay in restoring closes its normal contact 17,:again closing a circuit for the supervisory lamp SS. The opera-toinoting the lighted'signal SS knows that the subscribers have finished conversation and withdraws the plugs P and P from their respective jacks, and .the withdrawal of the plug P from the jack J opens the series circuit of the cut-off relay CO and the sleeve relay SL of the circuit'E. .The sleeve relay 8L restoring opens its alternate contact 9, allowing relay RT to restore,iand the opening of the contact .9 ctlaces the signal SS, rendering the circuit E available for establishing other connections.

Should either subscriber A or B answer during a silentperiorhtherelay RT would energize over a circuit traced from ground at brush 7, through conductor segments 88 and 3?", brush 8. tip contacts of the plug P and jack J, through the winding 22 oi relay RT, conductor 23, alternate contact 24, conductor 25, tip contacts of the plug and jack P and J, through the now closed contacts of the substation switch book of the subscribers A or B, as 'the'casezinay be, back through the ring contacts of the plug and ack P and J, conductor 26, to battery and ground at alternate contact 2?. Relay RT opens the circuit of relay RC and also closes a locking circuit for itself, and the rest of the operation of the circuit is the same as previously described. Should either the calling or :alled subscriber of the party line wish to converse with another party onth'e same line, the flashing of the switch hook at the substation will flash the supervisory sig-' nal in the usual manner, and the operator in response to the signal actuates her listening key LK to connect her operators set 0 to the conductors 25 and 26 so that she may converse with the subscriber. Assuming that the subscriber A wishes to talk to the sub scriber D, the operator removes the plug P from the jack J and inserts it into the Y ]2.Ci{ J, which will cause lGcycle and 66 cycle ringing current to be delivered. The operator then actuates the re-ring key RE to open normal contact 43 to open the-locking circuit of the ringing trip relay RT.

The interrupter I rotating connectsthe 16 and 66 cycle of ringing'current from the generator G and G in ainanner similar to that previously described to signal both the calling and the called subscribers, and the operation of the circuit E is the same as already described. I

lVhile I have illustrated my invention operating in connection with certain circuit arrangements, it is to be understood that changes and modifications will readily sug gest themselves to those skilled in the art, and I, therefore do not wish to be limited to the exact arrangement shown, but aim to cover all such changes and modifications as come within the spirit and scope of the appended claims.

Vhat I claim as new and desire to sec ure by United States Letters Patent is:

1. A telephone system including a polystation telephone line terminating in the central exchange in-a jack, a manually con trolled operators circuit provided with a plug for connection to said jack and line, automatic'means associated with said c-ir cuit for alternately signaling two or" the substations connected to said line, and operatorcontrolled-means for connecting said automatic means to said telephone line and for selecting the automatic means to signal said two substations.

V 2. A'tclephone system including a polystation telephone line terminating in the central oflice in a spring jack, an operator controlled circuit provided with a plug terminal for connection to said jack and line, a plurality oii'sources of ringing current otdiiferent' characters, operator controlled means :for associating said circuit with two of said sources of current, and automatic means for connecting said last mentioned sources of current to said polystation line to signal a calling and a called substation upon said line.-

3. A telephone system including a polystation. telephone line terminating in the central office in a spring jack, a plurality of sources of ringing current, an operator controlled circuitprovided with a pair of plug terminals, one ot the plug terminals of said circuit being adapted to be connected to said polystation telephone line, and the other plug terminal being adapted to be associated with the two of said sources o'i' ringing current selected by the operator, and,

automatic means for connecting said last mentioned sources of current to said telphone line to alternately signal two of the substations thereon.

at. A telephone system including a polystation telephone line tern' inatin gin the central exchange in a spring jack, av plurality oi sources of signaling current, a inanuallycontrolled connecting circuit provided with a pair of operator controlled terminals, operator-controlled means for connecting one oi said terminals to said jack and line and tor associating the other of said terminals with two of said sources of current, automatic means for applying-the current from said sources of current to said polystation line to signal a plurality or". substations thereon. and operatorcontrolled key means for interrupting the application of ringing current to said line.

5. A telephone system including a polystation telephone line, an operator cont-roll d circuit provided with a terminal tor connection to said .line, a plurality of sources of ringing current of different characters, operator controlled means for associating said I circuit with two on the sources ofringing a called substation upon said line, and

supervisory apparatus for said circuit controlled over the telephone line for signalingthe operator when one of said subscribers removes his receiver. p 6. A telephonesystem including a polystation telephone line terminating in the central exchange in aspring ack, a plurality of sources of signaling current, a manually cont-rolled operators connecting link for associating selected pair of said sources of current with said polyst-at-ion line, interrupter means for alternately and intermittently connecting the said selected sources or current to said polyst-ation line for signaling two of the substations upon said line, means controlled from a substation on said line for preventing further application of signaling current to said line, and supervisory means for said circuit controllable over said polystation line.

7. A manually operated telephone system including a subscriber-s telephone line, a

' plurality of sources of signaling current, an

operators connecting circuit having manually controlled terminals for connecting two of said sources or current to said telephone line, and means associated with said operator controlled circuit for-disconnecting the current from said line and for preventing further applications of current from either of said sources to said telephone line, said means being controlled over said subscribers telephone line. i

8. A telephone system including a poly.- station telephone line-terminating inthe central exchange in a springijack, a plurality of sources of ringing current, a manually controlled operators link circuit-for associating said sources of current with said line, automatic means responsive to the connection of said link circuit with said line to alternately connect said sources of current. to said line, and subscribcr-controlled means for disconnecting said sources of current from said line during either ringing interval.

9. A telephone system including a subscribers telephone line terminating in a spring jack at the central exchange, a plu rality of sources of signaling current, a manually controlled operators link circuit for connecting both of said sources of current V to said telephone line, means associated with said operator controlled circuit for disconnecting current from said line and for preventing further applications of current from either of said sources to said telephone line, said means being controlled over said subscribers telephone line, and a supervisory device controlled by said last means.

10. A manually operated telephone system including a subscribers telephone line, a plurality of sources of signaling current, an operators connecting circuit having manually controllable terminals for connecting two of said sources or current to said telephone line, a relay in said circuit through which current is applied to said line, and means controlled by said relay for disconnecting said source or" c-urent from said line. 1

11. A manually operated telephone system including a polystation telephone line, a plurality of sources of signaling current,a switchboard operator controlled connecting link circuit having a pair of manually controlled terminals for associating a selected pair of said sources of current with said polystation line, interrupter means for alternately and intermittently connecting the said selected sources of current to said polystation line, and means controlled over said polystation line for I disconnecting said sources of current from said line when a subscriber responds either during a ringing interval or a silent interval.

12. A telephone system including a polystation telephone line, a plurality of sources of ringing current, a manually controlled operators link circuit for associating .said sources of current with said line, automatic means responsive to the connection of said link circuit with said line to alternately connect said sources'of current with said line, subscriber controlled means fordisconnecting the current from said line and for preventing further application of ringing current to said line, and a supervisory signal for said link circuit. t

13. A telephone system including a polystation telephone line terminating in a spring jack, a plurality of sources of signaling current terminating in spring'jacks, an operator controlled connecting link circuit for associating a selected pair of said sources of current, with said polystation line via said-first spring jack and one of said second spring jacks, interrupter means for alternately and intermittently connecting the said selected sources of current to said polystation line fo signaling two of the substations upon said line, and means controlled from a substation on said line for disconnecting said sources of current from said line when a, subscriber responds during a ringing interval and for preventing a further application of ringing current when the subscriber responds during asilent interval.

14:. A telephone system including a polystation subscribers telephone line terminating at the exchange in a spring jack, a plurality of sources of signaling current, an op erators circuit provided with a pair of manually-controlled terminals for connecting two of said sources of signaling current to said telephone line, automatic means for alternately supplying current from said sources of current to said line to alternately operate the call bells at two'of the substations on said line,- and automatic means controllable over said line for disconnecting said sources of current from said line when a subscriber responds during either ringing period. c

15. A telephone system including a subscribers telephone line terminating in a spring jack rat the exchange, a plurality of sources of signaling current terminating in spring jacks at the exchange, means for associating said line with two of saidsources of current via said first spring jack and one of said second spring jacks, automatic means for alternately connecting said two sources of current to said line, and subscriber-controlled means immediately operable when a subscriber responds to disconnect said sources of current fromsaid line.

16. A telephone system including a subscribers telephone line terminating in .a spring jack at a manually operated ex.- change, a plurality'of sources of signaling current terminating in spring jacks, means for associating said line with two of said sources of current via said first spring jack and one of said second spring jacks, auto-T inatic means for alternately connectingsaid ed to said line for immediately disconnecting the said sources of current from said line. 17. A telephone'system including a party line, a plurality of ringing generators for supplylng ringing current of different char acters, an operator-controlledcircuit for associating said party line with two otsaid generators, means for alternately supplying current from said selected generators to said line, a relay through which the ringing currentis connected to said line. and means responsiveto the operation of: said relay for disconnecting the two generators from said line.

operable when 18. A telephone system including a party line, a plurality of ringing generators for supplying ringing current of different characters, an operator-controlled circuit for associating said party line with two of said generators, means for alternately supplying current from said selected generators to said line, a relay through which the ringing current is connected to said line, means responsive to the operation of said relay for disconnecting two generators from said line, a locking winding for said relay, and operator-controlled means for opening the circuit of said locking winding.

19. A telephone system including a poly- I station telephone line, a plurality of sources of signaling current, an operator-controlled connecting link for associating a selected pair of said sources of current with said polystation line, interrupter means 'for alternately and intermittently connecting the said selected sources of current to said polystation line, a relay through the winding of which the ringing current is connected to said polystation line, and subscriber-controlled means for actuating said relay.

20. A telephone system including a poly station telephone line terminating in a spring jack at the central exchange, a plurality of sources of ringing current, an operator-controlled link circuit provided with a pair of manually-controlled terminals for connecting said line with two of said sources of current, a key for said circuit for connecting the operators telephone set to said line, a relay for said link circuit responsive to a control exercised at any of the substations on said line, asecond relay controlled by said first relay, said second relay being adapted to disconnect the ringing current from the said line and to connect talking current thereto, and an auxiliary contact for said key in the circuit of said second relay.

Signed by me at Chicago, in the county of Cook and State of Illinois, this 3d day of August, 1918.

GEORGE A. YANOCHOVVSKI. 

